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Question

During photorespiration, the oxygen consuming reaction/reactions occur in

A
stroma of chloroplasts
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B
stroma of chloroplasts and mitochondria
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C
stroma of chloroplasts and peroxisomes
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D
grana of chloroplasts and mitochondria
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Solution

The correct option is C stroma of chloroplasts and peroxisomes
During photorespiration, the oxygen consuming reactions occur in the stroma of chloroplasts and peroxisomes. In chloroplasts, RuBP (5 carbon compound) on receiving oxygen gets converted into PGA (3 carbon compound) and phosphoglycolate (2 carbon compound). In peroxisomes, glycolate on receiving more oxygen gets converted into glyoxylate.

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